Bolt for chilled plows



(No Model.)

T. M. BISSELL.

BOLT FOR GHILLED PLOWS.

' No. 256,275. Patented Apr. 11,1882.

UNITED gTATES ATENT rarest THELUS M. BISSELL, OF SOUTH BEND, INDIANA.

BOLT FOR CHlLLED PLOWS.

SPECIFICATION forming part of Letters Patent No. 256,275, dated April'11, 1882.

Application filed December 539, 1881. (No model.) A

To all whom it may concern:

Be it known that I, THELUs M. BISSELL, of South Bend, in the county ofSt. Joseph and State of Indiana, have invented certain new and usefulImprovements in Bolts for Chilled Plows; and I do hereby declare thatthe following is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, which form part of this speciligation, in which- Figure1 is a perspective view of my bolt. Fig. 2 is a central vertical sectionof the same; and Fig. 3 is a View of part of a mold-board withbolt-holes adapted to receive these bolts.

The special object I have in view is to provide means whereby thechilled mold-boards of chilled plows may be more thoroughly and preventthe perfect scouring of the plow; and,

again, as the head wears away itloses its gripe-that is, the flare isnot suificient to keep the mold-board solidly to its place. When theshaft of the bolt is made square it is apt to break the casting throughwhich it passes. All

' of the aforesaid difficulties are obviated by constructing a bolt as Iwill now proceed to describe.

A represents my bolt, consisting of the uniformly-round shaft (1,provided with screwthread I), and oblong conical head 0, with shoulder(1. It will thus be observed that .while I consequent upon the use ofthe ordinary round bolt as the oblong head will prevent it turning, andthe conical surface will admit of so casting the holes in the mold-boardas will avoid checking in casting or cooling, while the shoulders willalways wear smoothly with the mold-board, and yet contain metalsuflicient to hold firmly.

Another advantage of my bolt is that the shaft may be made small enoughto pass through the lighter castings on the under side of themold-board.

I am aware that there have been used with chilled mold-boards bolts withconical circular heads having a shoulder, and bolts having oval headswithout a shoulder, as well as bolts having conical circular headswithout a shoulder, and do not wish to be understood as claimin such asmy invention; but What I do claim, and desire to secure by LettersPatent, is- V 1. A bolt formed as herein described-that is to say, witha round shaft of uniform diameter, having at one end a screw-thread andat the other a shouldered oblong conical head, all substantially as setforth.

2. The combination, with a chilled moldboard provided with ovalapertures, of a bolt constructed with a shaft of uniform diameter,

having a screw-thread at one end and ashoul- THELUS M. BISSELL.

Witnesses ANDREW ANDERSON,

JAMES DU SHANE.

